package com.lagou.client;

import com.lagou.codec.RpcEncoder;
import com.lagou.protocol.RpcRequest;
import com.lagou.serialize.JSONSerializer;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class RpcConsumer {

    //创建线程池对象
    private  ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private  UserClientHandler userClientHandler;

    //1.创建一个代理对象 providerName：UserService#sayHello are you ok?

    public Object createProxy(final Class<?> serviceClass, final String server, final int port){
        //借助JDK动态代理生成代理对象
        return  Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class<?>[]{serviceClass}, new InvocationHandler() {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //（1）调用初始化netty客户端的方法
                System.out.println("RpcConsumer.invoke"+ server+":"+port);
                if(userClientHandler == null){
                 initClient(server,port);
                }

                //封装请求对象 RpcRequest
                // public RpcRequest(String requestId, String className, String methodName, Class<?>[] parameterTypes, Object[] parameters) {
                //String[] split = providerName.split("#");
                String requestId = UUID.randomUUID().toString();
                String className = serviceClass.getName();
                String methodName = method.getName();
                Class<?>[] parameterTypes = new Class[args.length];
                for (int i = 0; i < args.length; i++) {
                    Class<?> aClass = args[i].getClass();
                    parameterTypes[i] = aClass;
                }
                //public RpcRequest(String requestId, String className, String methodName, Class<?>[] parameterTypes, Object[] parameters) {
                //封装请求对象
                RpcRequest request = new RpcRequest(requestId,className,methodName,parameterTypes,args);

                // 设置参数
                userClientHandler.setPara(request);
                // 去服务端请求数据
                return executor.submit(userClientHandler).get();
            }
        });


    }



    //2.初始化netty客户端
    public void initClient(String server,int port) throws InterruptedException {
        System.out.println("RpcConsumer.initClient"+ server+":"+port);
         userClientHandler = new UserClientHandler();

        EventLoopGroup group = new NioEventLoopGroup();

        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
                        pipeline.addLast(new RpcEncoder(RpcRequest.class,new JSONSerializer()));
                        pipeline.addLast(new StringDecoder());
                        pipeline.addLast(userClientHandler);
                    }
                });

        //bootstrap.connect("127.0.0.1",9998).sync();
        bootstrap.connect(server,port).sync();
    }


}
